材料科学
电磁线圈
电流(流体)
磁铁
工作(物理)
导电体
激发
拉伤
应变计
机械
复合材料
机械工程
电气工程
物理
工程类
医学
内科学
作者
Liangjun Shao,Yongjie Zhang,Canjie Xin,Fang Liu,Yufan Yan,Yi Li,Yubin Yue,Z Xu,Peng Song,Xintao Zhang,Huajun Liu,Mingzhi Guan,Timing Qu
标识
DOI:10.1088/1361-6668/ad44e0
摘要
Abstract The screening-current effect is an inhomogeneous distribution of current density inside the REBCO conductors. The additional strain induced by the screening current, known as screening-current induced strain (SCS), is considered to affect the structural integrity of REBCO windings, especially when operating high-field REBCO insert magnets. In this work, we wound and tested a series of 50-turn REBCO coils inside a 10 T LTS external to investigate the influencing mechanism of multiple electromagnetic factors on SCS. We varied the critical current in different coils by different heat treatment procedures. Each coil was tested individually, experiencing a external field cycle and multiple operation current cycles at constant external fields. The extreme scenario for each coil was being energized to 400 A while the external field was 10 T. We adapted the discrete-coupled model to estimate the hoop strain distribution, monitored the experimental results by multiple strain gauges at the outermost turn. Test coil with a lower critical current endured a lower maximum hoop strain. When we were energizing the test coils, hoop strain increased at the edge of REBCO tapes while remaining nearly constant in the middle region. Additionally, the maximum hoop strain at the outermost turn decreased after each excitation cycle. This work could be an experimental reference for optimizing the electromagnetic design and the excitation scheme during the development of high-field REBCO magnets.
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